Numerical modeling of iron yoke levitation using the pinning effect of high-temperature superconductors

Mojtaba Ghodsi*, Toshiyuki Ueno, Hidekazu Teshima, Hosei Hirano, Toshiro Higuchi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


A ferromagnetic material can be levitated by the pinning effect of a field-cooled superconductor. This paper presents two methods for modeling this effect: 1) an approximate calculation to determine the relationship between attractive force and air gap at both room temperature and superconductive temperature (77 K) and 2) a novel way of modeling the pinning effect by a finite-element method (FEM). A comparison of analytical and FEM results with experimental results verifies the validity of the methods. The methods can be used to estimate the system's behavior when the cylindrical yoke is replaced by a ring yoke. The stiffness of the system will increase by 70% (to 5.3 N/mm) when a ring yoke with the same surface area is used instead of a cylindrical yoke.

Original languageEnglish
Pages (from-to)2001-2008
Number of pages8
JournalIEEE Transactions on Magnetics
Issue number5
Publication statusPublished - May 2007
Externally publishedYes


  • Analytical model
  • Field-cooled high temperature superconductor
  • Finite-element method (FEM)
  • Maxwell theory
  • Numerical modeling
  • Pinning effect
  • Shape effect

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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